The HYS 64V64220GU and HYS 72V64220GU are industry standard 168-pin 8-byte Dual in-line Memory Modules (DIMMs) which are organized as 64M x 64 and 64M x 72 in two banks high speed memory arrays designed with 256M Synchronous DRAMs (SDRAMs) for non-parity and ECC applications. The DIMMs use "-7" speed sorted 256 Mbit Synchronous DRAMs (SDRAMs) to meet the PC133-222 requirements, "-7.5" for PC133-333 and "-8" components for PC100-222 applications. Decoupling capacitors are mounted on the PC board. The PC board design is according to INTEL's module specification. The DIMMs have a serial presence detect, implemented with a serial E2PROM using the 2-pin I2C protocol. The first 128 bytes are utilized by the DIMM manufacturer and the second 128 bytes are available to the end user. All Infineon 168-pin DIMMs provide a high performance, flexible 8-byte interface in a 133.35 mm long footprint, with 1.25" (31.75 mm) height.